Bazooka Balun Dipole. EZ Hang Square Shot Kit. An antenna tuner with a built in balun matches the feed-line impedance to the 50-Ω coax to your radio. The G5RV Pro ZS6BKW. Type 43 and type 61 "split cores" (clip on beads), or even better the same cores that aren't split (meaning you have to put the bead on the cable before putting the connector on the cable) can provide several hundred ohms each. We will be continually updating this page as we launch new reviews. Musings on Antennas, Tuners and Baluns. Onlangs maakte ik een ZS6BKW antenne, door een 2 x 13,75 meter dipool te voeden via 12,2 mtr 450 Ohm lintkabel voor je naar de coax gaat. Strange 20m results? 73 de Eddie Ra pid D eployment A mateur R adio. After I received the 1171 balun, I completely re-did the feed entrance again. Boucle de 83 mètres. The method of construction and tuning is essentially the same for both antennas but the dimensions are different. Inserting a choke balun into the feed connection has cured that completely according to tests done so far on summits. The G5RV antenna (c. this balun provides for a cleaner symmetry and also serves as a choke. 3m) long- almost vertical but comes into the house about 3 ft above ground level using commercial feed made from copper clad steel to an antenna matching unit (Palstar AT1KM) 66. Hij zorgt ervoor dat het vermogen goed gebalanceerd wordt afgegeven aan de 450 ohm lijn. Huntsville Store: Skip to the end of the images gallery. In addition they are often under-sized which causes unnecessary power loss. One Conductor from Balun or Tuner to Far End Insulator (TM) No Splices, Solder or Crimping to Fail. Multiband “Fan” Dipole – click for a larger image and more details. a balun is used. Maybe it’s worth it. The ZS6BKW Antenna Depending on which bands you want to operate , there is a better design which involves shortening the antenna and lengthening the section of ladder line. In addition they are often under-sized which causes unnecessary power loss. With a detailed analysis of the lengths and the transformation of the parallel wire line we tried to. The WireMan, Inc. Multiband “Fan” Dipole – click for a larger image and more details. It is worth noting that several of the accepted authorities on this board use a 1:1 current balun made out of cores and coax for this function. Getting rid of the G5RV coax improved performance significantly - I can get an indicated 1:1 match on all the HF bands on the input to the matching unit. 1946) was designed by Louis Varney (G5RV, SK). 96% Nominal Velocity Factor. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher. The popular multiband baluns use ferrite loading to achieve a wide bandwith--this works well, but only if the impedance is kept low. The G5RV is probably the most popular multi band antenna in the world. Available. Marc, N4UFP, and I get together to talk about, build and test the ZS6BKW antenna. And rightly so because this antenna turns out miraculous. The reason for doing it this way is to avoid using an expensive remote tuner, and instead use a cheap balun, a cheap antenna tuner, and I got a good deal on the coax. The ZS6BKW is not a perfect antenna. Maple Leaf Studio is a "labor of love". Comet CBL 1000 Balun 1KW. If the impedance gets too high, the SWR will drift as the balun heats up and eventually fails. like the ZS6BKW i was using at the QTH at the time of writing. Die Tauglichkeit der Antenne zusammen mit dem GC-3000 hat sich am letzten Sa/So am CQ WW DX Contest wieder bewiesen. It's no wonder it's an efficient multi-band antenna that's only 52 ft. This portion becomes an inverted "L" ungrounded quarter wave vertical, 39 meters in length, made up of #14 stranded (7x22) copper-clad antenna wire. One element of the original design that seems odd is the suggestion that no balun is needed at connection between the twin-feeder and. Introducing the W8AMZ 80–6m OCF / Windom Multi-Band Antenna using a 4:1 Balun and rated for 2 KW. Computer Optimized G5RV design. High Quality PVC Dogbone Insulators; Uses Top Quality 1:1 Balun; This G5RV is 92 feet long. Ham Radio Antenna Wifi Antenna Radio Shop Hf Radio Ham Radio Operator Radio Band Cool Wood Projects Electrical Projects Diy Speakers This aerial covers the 20, 17, 15, 12 and 10 metre bands and is made from a single 3 metre length of 22 mm copper tube cut into 4 pieces of equal length. The ZS6BKW is a 92 ft center-fed dipole fed with 40' of 450 ohm ladder line plus coax the rest of the way to the shack. (50Ω to 200Ω). 1946) was designed by Louis Varney (G5RV, SK). ZS6BKW zonder balun. When Louis Varney invented the G5RV it was done with Smith Charts and slide rules, velocity factors of wire insulation and many other important antenna parameters were not factored into the equations. LDG desktop tuners are perfect for your home shack, but can also be used portable or mobile if the need arises. GB Center Connector. The ZS6BKW JUNIOR antenna is an optimized variant of the venerable old G5RV. Quality 450 Ohm Ladder Line and Stranded Tinned Copper Wire. Use as inverted vee or sloper to be more compact. SWR Chart (Using the. Brian Austin ZS6BKW (ahora G0GSF) encontró que era posible optimizar las dimensiones G5RV con el fin de conseguir una mejor resonancia en las bandas de 40, 20, 17, 12 y 10 m. I can set the mast at the edge of the woods or maybe into the clearing about 30 yards away from the house running the wire through the trees. Search Search. ZS6BKW antenna and balun. Having a keen interest in wire antennas your writer "just had to build a ZS6BKW antenna". A low Insertion VSWR high Zcm Guanella 1:1 balun for HF This article describes a Guanella 1:1 current balun which has high common mode impedance (Zcm) and low Insertion VSWR. Basically the antenna is 94 feet long fed with 40 feet of 450 ohm twin lead with 1:1 balun at bottom of the twin lead where the coax is attached. this balun provides for a cleaner symmetry and also serves as a choke. Here's a picture and a description of one used on a ZS6BKW by a well-known poster:. The ZS6BKW does NOT work well on 15 meters, and needs a tuner to work well on 80. Mastrant-P - 5mm - 325ft. Although some claim the popular G5RV antenna works well on all bands, 80 through 10 meters, that is not the case. Boucle de 83 mètres. ZS6BKW-dipole under the spiderbeam HighGain Balun 1:1 met 2,5² spliced speaker-wire for the 30M Dipole 30M-dipole at the top of the spiderbeam met Ameritron 5-wayCoaxswitch. Available. EAntenna products online from ML&S Martin Lynch & Sons. This makes it convenient to feed the antenna directly with low impedance 50 ohm coax cable. The Balun Designs 1171, mounted about 10 feet high on the 4x4 pole. G5RV HF Antenna. G5RV multi-band antenna,2. Comet CBL1000 balun 1 KW. 261 Pittman Road, Landrum, SC 29356. Home; Visiting Belgium; UBA; Organisations; HF; UBA Members. Particularly important is the fact that this new antenna is designed for use with 50 ohm cable and not the 70-100 ohm twin lead of 1958. Amateur Radio (G3TXQ) I became interested in radio in the late 1950s when my parents bought me an Ivalek crystal set as a Christmas present, and later on an ex-army receiver - the Wireless Set R208 - which was advertised at the time as the "Sputnik Special" because it covered the low VHF frequencies used by the first Russian satellites. The ZS6BKW is a 92 ft dipole fed with 40' of parallel line plus coax the rest of the way to the shack. Mobile Antennas. In addition they are often under-sized which causes unnecessary power loss. ZS6BKW versus G5RV - Part 2 I have written about the ZS6BKW some time ago in September 2012. zonder balun. I am preparing to construct a resonant, center-fed, horizontal dipole. The ZS6BKW worked fine without the need for an ATU on 80M (a very slim bit), 40M, 20M, 17M, 12M and 10M but was untunable on the rest of 80M and all other bands with the TS590 built in ATU. The ZS6BKW antenna Will prcduce a better than VSWR on parts of five amateur bands (7, 14, 18. all the parts you can change if you wanted. The improved SWR is retained with an antenna as inverted "V" configuration, only the resonance decreases. The design appeared in TT (RadCom) Jan & Feb 1993, but is also in Pat Hawker’s “Antenna Topics” (publ. Worse on some bands than others. I have seen people use baluns at the feedpoint of the antenna, and some people swear by them, but I have never gotten a satisfactory answer on why you would use/need a balun. We don't use low-budget accessories. Portable End-Fed 40-6 Meters Dipole Antenna. (Half Size) Ham Radio Antenna: This project gives instruction on how to build my version of the G5RV wire antenna that is used on the 10-40 Meter Ham Radio bands (28MHZ to 7MHZ). The design appeared in TT (RadCom) It's only 90 ft long (27. Using RG-11 for the 75 Ω line you could probably work the bottom half of 80 m with acceptable line losses as well as the other ZS6BKW bands. Of course this where the 300 ohm feeder is attached to the 50 ohm coax (or to be absolutely correct the 75 ohm). Holding true to the original Windom formulas, I used a ratio of 37. Questions about G5RV Jr. I use ferrite sleeve (‘choke’) baluns, constructed with 25mm HP pipe, RG8-X coaxial cable The Wireman (US) and 8 of Amidon ferrite beads type FB-31-5621. 3 ft shorter wire 11 ft longer ladder G5RV ZS6BKW. Louis Varney (G5RV) invented this antenna in 1946. Mobile Antennas. Using 32 m of 75 Ω line and raising the antenna up to 20m indeed improves a little the 80 m resonance. Moxon Antenna Pattern. VK2FUO acknowledges author Martyn G3UKV. 35 wavelengths. ZS6BKW (aka G0GSF), similar to the G5RV, but it actually resonates on 6 bands, and doesn't rely on a tuner (ATU) to make it work. 5 - 54MHz 5kW #4115ocf from Balun Designs. Un balun 1:4 de corriente. •He found / read with highly reactive Z’s: –SWR above 2:1 the losses increase and cores will saturate – losing RF power to heat. Buy EAntenna G5RV @ZS6BKW 10-80 m. ZS6BKW G5RV modifiée, antenne multibande, radioamateurs. My homebrew ZS6BKW is 28. lengte 2 x 7,75 meter. It can be used on any band from 80 through 6 meters, including the W. Out-of-Stock. The G5RV antenna is a dipole with a symmetric resonant feeder line, which serves as impedance matcher for a 50 ohm coax cable to the transceiver. Maten ZS6BKW multiband Antenne voor 10-80mtr. A balun goes between the twin lead and the open wire. 24 and 28MHz). Viewing products 1 - 16 of 16. 3 ft long) but my question is about the 450 ohm ladder line feeder length. Particularly important is the fact that this new antenna is designed for use with 50 ohm cable and not the 70-100 ohm twin lead of 1958. This is a popular antenna design as the - Balun Designs This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. long, often too long for vertical deployment with telescopic poles and not too practical in highly constrained…. Onderstaande tip komt van Rob PA3EKE. Actually, it’s a design from ZS6BKW (aka G0GSF), similar to the G5RV, but it actually resonates on five bands, (well 6, actually) and doesn’t rely on a tuner (ATU) to make it work. Various sizes of a ZS6BKW antenna can be found on the Internet, so that the original design of ZS6BKW is often overlooked. It is similar to the famous G5RV antenna, which can cover multiple HF Bands but requires an antenna tuner on most bands. Multi-band HF Antennas Part 1 - VA3TPV ZS6BKW. Here is the ZS6BKW antenna installed at AK6R fine tuned for the CW/FT8 frequencies on 40-20-17-12-10 meters. I've always been a fan of wire antennas. Onlangs maakte ik een ZS6BKW antenne, door een 2 x 13,75 meter dipool te voeden via 12,2 mtr 450 Ohm lintkabel voor je naar de coax gaat. Home; Visiting Belgium; UBA; Organisations; HF; UBA Members. Having a keen interest in wire antennas your writer "just had to build a ZS6BKW antenna". Or, if you are ready to purchase, see the How To Order page. ¡Móntalo tú mismo! (Autor: EA1HBX) Vamos a por otro de los que tienen demanda. The SWR measurements were taken at the end of the feedline, not at the W2AU balun feed point. The 4-Band antennas are OCF (off-center-fed), with a 23 foot leg and a 45 foot leg, totaling 68 feet. These improvements allow it to be used on more bands, and to exhibit better SWR on several Bands. My homebrew ZS6BKW is 28. 3-1/2" Wire Spacing. Covers all bands, 160-10 Meters with antenna tuner. "Hi Bob, the balun/choke (ed note model 1116dt) is working out great on the ZS6BKW antenna, I only need to use the tuner on 80/75 and 15 meters plus now it seems that the power company has made changes on correcting the problems with the power lines and my noise level has dropped by allot (S9+10 to S1). So, it's a cousin to the G5RV (which only resonates on 14 & 24 MHz), but better as it needs no ATU on 40, 20, 17, 12, 10 and 6 metres. It is also possible to get multi-band operation with a 4:1 balun at the feedpoint (I use an Elecraft BL1 with a "pig-nose" (2-hole) ferrite core, plus a W2DU-type 1:1 current choke balun) and coax to the transceiver. Rotating Dipole 40m-6m. The antenna tuning matching unit provides two. The SWR is generally below 1. 73 - Joe K1JEK [email protected] G5RV without balun. 2m 6m 10m 15m 20m 40m 43 foot 70cm 80m AHVD Aluminum APRS Baluns battery BigIR collinear Diamond dipole DX-Eng. Single band half-wave dipole antenna. The ZS6BKW is a “random length dipole” with ladder line acting as a 1:1 transformer. Using RG-11 for the 75 Ω line you could probably work the bottom half of 80 m with acceptable line losses as well as the other ZS6BKW bands. Mastrant-P - 5mm - 325ft. No-Tuner 20m-10m Doublet. Using a tuner, 6, 15, 30 & 80m bands are attained with. I prefer to use 450 ohm 18 AWG solid ladder line which is readily available on ebay in appropriate lengths (20m). All Band Performance 80m-6m. Operating the ZS6BKW on 60m, 30m, and/or 15m (No Tuner Required) Cecil Moore, www. Plug your coax right into this antenna. The only time the transformation is 1:1 is when the impedance looking into the ZS65BKW is 50 ohms because that's the only time the SWR is 1:1. DX Engineerings 300 ohm line (VF=0. Rotating Dipole 40m-6m. Icom IC-703 operating on 80m. Ham Radio Radios Hams Ham. Moore and I have been trading emails over the past few months and he just published an article entitled How to Transform Your ZS6BKW Into an All-HF-Band Antenna. The G5RV is probably the most popular multi band antenna in the world. The ZS6BKW is not a perfect antenna. Anvendelse af en balun har andre fordele såsom mindre modtagent støj og øget ydelse Hvis en balun ikke anvendes, anbefales 50 ohm kablet at være mindst 20 meter langt. BUILD AN AIR WOUND 1:1 CHOKE BALUN FOR HF - THE UGLY BALUN! What others are saying. Cheap HF Homebrew 40m 20m 15m Vertical antenna. A shortened Fan Dipole is a dual-band dipole with a full-size dipole also tied to the same center insulator. Please feel free to contact me with any questions you may have. W1JR choke/ balun on a ZS6BKW doublet? | QRZ Forums. ZS6BKW-Light 80-10m (mit Balun) 28,00 m: 200 Watt SSB/CW: mit Balun: 95,00 €. Many of our RFI and Ferrite Core products are available at HAM RADIO OUTLET stores. We will be continually updating this page as we launch new reviews. This balun, wound on a T240-43 core, has an extremely wide load balance due to the third balance winding. which will be sloped slightly, as I don't see a way to get the peak above 35' Suffice to say, the best I MIGHT be able to do is sneak in this low ZS6BKW(G5RV) as an inv. Avec balun à air 4/1. GB Center Connector. My first attempt on HF and installing a G5RV wire antenna, I used a 30 foot fishing pole to support the centre section of the antenna, the antenna is a full size hard drawn G5RV from Moonraker. Bazooka Balun Dipole. ZS6BKW-dipole under the spiderbeam HighGain Balun 1:1 met 2,5² spliced speaker-wire for the 30M Dipole 30M-dipole at the top of the spiderbeam met Ameritron 5-wayCoaxswitch. There is no similar antenna that is based via balun Ground 7. Prof Austin was engaged at the Faculty of Electrical Engineering at the University of the Witwatersrand, Johannesburg, South Africa, when the following article appeared in RadioZS of June 1985. Add common mode current suppressor here (Only if needed) (Use Ferrite beads or ring instead of expensive high quality balun) Antenna Article ZS6BKW (4) ZS6BKW / G5RV Why I like it 1. To minimize the chance of common mode currents on the coax that can cause the coax to become part of the antenna a balun is sometimes used. KX4O 1B VA Field Day 2012 2m 6m 10m 15m 20m 40m 43 foot 70cm 80m AHVD Aluminum APRS Baluns battery BigIR collinear Diamond dipole DX-Eng. W1JR choke/ balun on a ZS6BKW doublet? | QRZ Forums. We don't use low-budget accessories. Here's the "switchable ZS6BKW/G5RV" with "removable feedlines" model. Prof Austin was engaged at the Faculty of Electrical Engineering at the University of the Witwatersrand, Johannesburg, South Africa, when the following article appeared in RadioZS of June 1985. € 98,35 (Excl. Notice that:. 5:1 or less. 05 mtr On the website you can read that is advisable to feed the ladder line into a choke balun. The ZS6BKW antenna is an optimized variant of the venerable old G5RV. Yellowjack tower tool with lanyard. However, in order to maintain a balance an equal amount of length is required to be added to the antenna itself. Wire Antennas provide multi-band coverage with just one wire antenna. Hij zorgt ervoor dat het vermogen goed gebalanceerd wordt afgegeven aan de 450 ohm lijn. I just put up an OCF dipole using an excellent 4:1 balun the OCF Dipoles 1. NVIS Antenna Information Near Vertical Incident Skywave (NVIS) Antenna - W0IPL Commercial Windom/OCF Antennas Balun Designs - Baluns Maxcon Antennas Radio Works Antenna Design & Information Sources 4NEC2 - modeling software Antenna Elmer. If you prefer to submit a PDF form you can download the form HERE. 35 wavelengths. Dependiendo de la impedancia de línea de alimentación equilibrada , hay que ajustar la longitud del dipolo. Designed as 3/2 wavelength antennas for 14 MHz, they provide reasonable performance on many other bands. No-Tuner 80m-10m Doublet. The antenna tuning matching unit provides two. So in the receiving part it is a very nice antenna to listen on. When the dipole is used at a non-resonant freq. 40m Dipole on 15m. this balun provides for a cleaner symmetry and also serves as a choke. Dit doen we door aan beide uiteinden van de dipolen 2 stuks verlengspoelen te plaatsen. 4m; ZLL 420Ω; Height 20m. Before you buy anything, build a simple 40m dipole with a 1:1 current balun and. In essence the antenna is a dipole flattop 92' long with 39' of 450 ohm ladder line into a 1:1 choke-balun to 50 ohm coax. Musings on Antennas, Tuners and Baluns. Phone: (800) 727-9473 Orders: (864) 895-4195 Email: [email protected] Web: TheWireMan. Achter de spoelen komt nog 2. Ladder-line feed may have to be trimmed for lowest SWR, but using about a 100 foot length seems to make for easier tuning on all bands. The method of construction and tuning is essentially the same for both antennas but the dimensions are different. If installed correctly, what kind of performance could I expect from it?. The final ZS6BKW antenna is a 2 × 13. This is a much MUCH better performer than the heavily marketed G5RV! If you're only going to have one antenna. This is the antenna for you guys who want to get on HF effectively, and haven't too much space or cash to throw around. I suggest anyone reading this post, obtain a copy of Walter Maxwell's excellent book Reflections III. I've even run the BKW without any choke at all and have never had any issues. Notice that:. Please feel free to contact me with any questions you may have. 73 - Joe K1JEK [email protected] It needs a 1:1 choke-balun at the BALanced twinlead to UNbalanced coax junction. , extreme low or high impedances) at the tuner end, on all bands. A good 1:1 choke balun at the coax to twinlead junction virtually eliminates common mode current on the coax. The next evolution in the search for the all band HF antenna was made by Brian Austin, ZS6BKW, now G0GSF, who in 1985 was a professor at the University of Witwatersrand, Johannesburg, South Africa. LDG makes a full line of Baluns and Ununs. It is necessary to ensure that there is a balanced to unbalanced transition, i. SHORTWAVE WIRE ANTENNAS G5RV to ZS6BKW modification useable for 40, 20, 17, 12, 10 and 6m my goal for this work: In 2007 I installed an G5RV antenna to make my first steps on shortwave. I have collected the questions and boiled them down to 10, all of which have many variations. Actually, it's a design from ZS6BKW (aka G0GSF), similar to the G5RV, but it actually resonates on five bands, (well 6, actually) and doesn't rely on a tuner (ATU) to make it work. All you need is a 1:1 current choke. At WiMo for example the 4:1 balun coming with their G5RV is designed such a way that it protects the SO-239. The popular multiband baluns use ferrite loading to achieve a wide bandwith--this works well, but only if the impedance is kept low. However, I chose not to do so as a way to give back to this wonderful hobby community, which indirectly has given me a lot. The ZS6BKW antenna is an optimized variant of the venerable old G5RV. Custom versions of any of our products are available; please contact us with your requirements. Rotating Dipole 40m-6m. The ZS6BKW Antenna Depending on which bands you want to operate , there is a better design which involves shortening the antenna and lengthening the section of ladder line. I use ferrite sleeve (‘choke’) baluns, constructed with 25mm HP pipe, RG8-X coaxial cable The Wireman (US) and 8 of Amidon ferrite beads type FB-31-5621. The SWR is generally below 1. •Design Note: only use core based baluns in matched. What does this mean? I modeled some antennas and can match the NorCal doublet (60-10m), ZS6BKW (all bands it was designed for. pdf http://www. The diagram above shows what can happen if you don't include the balun; it is an EZNEC model of a G5RV antenna system. An antenna tuner with a built in balun matches the feed-line impedance to the 50-Ω coax to your radio. met 1:1 balun. ZS6BKW / G5RV Optimized Multi Band Dipole Antenna Unlike the original G5RV that requires an antenna tuner on all bands, the ZS6BKW / G5RV is capable of operating on 10, 12, 17, 20 & 40m bands generally without a tuner, with SWR readings usually 1. Off-Center-Fed Dipole, OCFD, Windom, Whereas a Dipole is a half-wavelength long radiator, fed in the Center of two equal length legs, the Off-Center-Fed Dipole (which I prefer to call a WINDOM) is a Dipole whose feedpoint is at a point removed from the center of the antenna. The ZS6BKW type antenna is a version of the G5RV optimized by Brian Austin G0GSF (ex ZS6BKW). Unfortunately, this antenna is widely misunderstood. The method of construction and tuning is essentially the same for both antennas but the dimensions are different. This balun, wound on a T240-43 core, has an extremely wide load balance due to the third balance winding. like the ZS6BKW i was using at the QTH at the time of writing. AE4VJ 10,704 views. GB ZS6BKW 10-80 +60m. Sure, they can be tricky to build as they generally require the dexterity of 3 hands when winding+holding everything in place… In my original experiments, I wanted to learn a bit more about Baluns, UnUns and how best (ie: effectively and cheaply) to address common-mode. I have long been a fan of the balanced transmission line for efficiently transferring power from the transmitter to the antenna but that's not the only component in the system that can be lossy. 5:1 on 6, 10, 20, 40 & 80m bands and can be operated without an antenna tuner. After further investigation I built the ZS6BKW/G0GSF version of the G5RV. My first attempt on HF and installing a G5RV wire antenna, I used a 30 foot fishing pole to support the centre section of the antenna, the antenna is a full size hard drawn G5RV from Moonraker. G0GSF (ex-ZS6BKW) came up with a similar design that is a significant improvement over the G5RV. on 160 meters. To Balun, or not to Balun…. 5m; ELLL 13. Still testing both but so far the ZS6BKW has been most impressive on 40 and 20 meterers (will tune on 80 but with higher SWR due to shorter length. 261 Pittman Road, Landrum, SC 29356. At WiMo for example the 4:1 balun coming with their G5RV is designed such a way that it protects the SO-239 connector from the rain when it is hanged in vertical position, the coaxial being screwed over 2 cm inside the balun. The mast can get up to 40' or so, which will make for a good apex. I prefer to use 450 ohm 18 AWG solid ladder line which is readily available on ebay in appropriate lengths (20m). Zs6bkw_vs_G5rv_20100221b - Free download as PDF File (. lengte 2 x 13,75 meter. Boucle de 83 mètres. The all-band doublet horizontal wire antenna has a history almost as long as amateur radio itself. Perhaps too many new hams embarking on their first HF adventures think only of resonant dipoles fed with coaxial cable and plugged directly into the transceiver's output connector. The Cobweb 5 bander CobWeb Antenna is a High Quality designed antenna with products from Europe. The ZS6BKW JUNIOR(early 1980's) was derived from the G5RV by Brian Austin (G0GSF, formerly ZS6BKW). Ham Radio Antenna Wifi Antenna Radio Shop Hf Radio Ham Radio Operator Radio Band Cool Wood Projects Electrical Projects Diy Speakers This aerial covers the 20, 17, 15, 12 and 10 metre bands and is made from a single 3 metre length of 22 mm copper tube cut into 4 pieces of equal length.  The antenna is designed  with the dipole arms electrically 1. Designed as a three half wave collinear for 20m it was soon discovered that the twin feeder allowed multi band operation. The image shown above has the 40m linear-loaded wire plus 20m+15m wires - The overall length of this aerial is 12m. No-Tuner 80m-10m Doublet. long--shorter than a 40 Meter dipole!. this balun provides for a cleaner symmetry and also serves as a choke. ZS6BKW construction details - VK2ACD. Before you buy anything, build a simple 40m dipole with a 1:1 current balun and. ZS6BKW vs G5RV - AARA Presentation, includes charts, plots, and MMANA-GAL files. It also works fine on all bands above 40m with a tuner, and even below 40m on 60m, and 80m, although the coax losses will be higher. This method, with the balun outside, and short coax coming in through a grounded bulkhead fitting, is what I recommend. Available on order from TTS Systems (Aus) You could also use RG213 with the larger size 1024 beads. where you go from. I use 40 ft of 450 ohm feedline that's 3 feet from the ground where the 1:1 choke balun is mounted. Modeling "Bent Dipole" (and Conventional) 4-Squares, with Feed Systems Line Lengths and Scope Traces for Lahlum/Lewallen Networks. Or, if you are ready to purchase, see the How To Order page. G5RV ZS6BKW Dipole length is 101. •Design Note: only use core based baluns in. The design appeared in TT (RadCom) Jan & Feb 1993, but is also in Pat Hawker’s “Antenna Topics” (publ. ZS6BKW Antenna --- by Maple Leaf Studio Antennas. Ik wil binnenkort een zs6bkw ophangen voor de banden 80m t/m 10m. ZS6BKW G5RV modifiée, antenne multibande, radioamateurs. 50mtr koperdraad. Multiband dipool 10 tot 40 meter. A velocity factor of 0,85 was used for the 300 ohm tape. Die ZS6BKW-Antenne ist auf der Grundlage der G5RV-Antenne entstanden. [ Home ] [ Antenna Grounds ] [ Balun and Transformer Core Selection ] [ Baluns on Log Periodic Antennas ] [ 1:1 current balun ] [ 4:1 balun design and operation ] [ Sleeve Baluns ] [ Tuner Baluns on Input ] [ toroid balun winding ] [ Transmitting Baluns ] [ Combiner and Splitters ] [ Common mode current ] [ Crossfire Phasing ] [ Curtain Antennas ] [ Detuning. Portable End-Fed 40-6 Meters Dipole Antenna. Because the 300 Ohm line is no longer easy to obtain, the program was used with a 450 Ohm type. 3m) long- almost vertical but comes into the house about 3 ft above ground level using commercial feed made from copper clad steel to an antenna matching unit (Palstar AT1KM) 66. The ZS6BKW is more sensitive, often delivering 1 to 2 S units better reception to the same signal source. The two baluns are shown in the photo below. Direct from Amidon (US). Volgens de specs resoneert dit op 10, 12, 17, 20 en 40 meter. Using RG-11 for the 75 Ω line you could probably work the bottom half of 80 m with acceptable line losses as well as the other ZS6BKW bands. In the mid-1980s, Brian Austin (ZS6BKW) ran computer analysis to develop an antenna system that would match the maximum number of HF bands possible without an antenna tuner, using 50-ohm coaxial cable as the main feed line. Baluns (and UnUns) and not complicated devices once you know the basics. Article de CQ magazine novembre 1995. Are you a fan of the G5RV antenna? Then you may be interested in the ZS6BKW JUNIOR antenna. Qrp Ham Radio Antenna 90 Degrees Building A House History Historia. This is the antenna for you guys who want to get on HF effectively, and haven't too much space or cash to throw around. Huntsville Store: Skip to the end of the images gallery. ZS6BNE Bungi shock. It needs no tuner on 40m, 20m and 10m. This is a popular antenna design as the - Balun Designs This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. Introducing the "All-Band" Doublet: What the Student and the Instructor Should Keep in Mind L. Jul 15th 2012, 15:52: W4RQ Joined: Apr 26th 2011, 23:40 Total Topics: 0 Total Posts: 0 I plan to build this Optimized G5RV (with the top section 90. Assuming the ferrite used in the w1jr balun is an acceptable material, e. Cebik - W4RNL. Because the Cobra antenna is a balanced load, it is recommended to install a 4:1 current-style balun at the station end of the feedline (many external tuners provide a built-in balun). The 1:1 balun is 18 turns of RG8x on two 2. long--shorter than a 40 Meter dipole!. "Hi Bob, the balun/choke (ed note model 1116dt) is working out great on the ZS6BKW antenna, I only need to use the tuner on 80/75 and 15 meters plus now it seems that the power company has made changes on correcting the problems with the power lines and my noise level has dropped by allot (S9+10 to S1). ZS6BKW & G5RV. Article de CQ magazine novembre 1995. All bands are covered, including 30, 17, and 12. In the mid-1980s, Brian Austin (ZS6BKW) ran computer analysis to develop an antenna System that, for the maximum number of HF bands possible, would permit a low Standing Wave Ratio (SWR) without antenna tuner to interface with a 50-Ohm coaxial cable as the main feed line. GB ZS6BKW 10-80-60m. Basicly the ZS6BKW is the "NEW AND IMPROVED VERSION OF MR. 9) Ladder Line 400-450 ohms (Wireman 554) Ladder Line 400-450 ohms (Wireman 554) 101. When the dipole is used at a non-resonant freq. I have long been a fan of the balanced transmission line for efficiently transferring power from the transmitter to the antenna but that's not the only component in the system that can be lossy. GB Center Connector. The ZS6BKW antenna is a better match for our bands than the G5RV. The ZS6BKW is a 92 ft dipole fed with 40' of parallel line plus coax the rest of the way to the shack. G5RV type Antenna Model G5RV-LLB for kit version Model G5RV-LLBA for assembled version (ZS6BKW version) Ladder-Loc 40' - 1. 0, 03/16/2018. I briefly considered patenting my design. Direct from Amidon (US). Windom-balun - winding instructions Windom Antenna the Carolina version Windom Off Center Feed - W8JI. How to build a ZS6BKW Antenna - VK2KMI. This is an improved design, which has been optimised for true multiband operation with a 50 ohm coax feed. Computer Optimized G5RV design. dipole (300 Ohm) - R2010027 EAntenna online at £69. My homebrew ZS6BKW is 28. So the measurements are for my ZS6BKW: Length of the dipole: 2 times 14. That is, this is the SWR that a tuner would have to handle. Mastrant-P - 5mm - 325ft. This package will give you the same band coverage. The G5RV antenna is a dipole with a symmetric resonant feeder line, which serves as impedance matcher for a 50 ohm coax cable to the transceiver. Cb dipole antenna Cb dipole antenna. Despite all the words and diagrams in handbooks over the years, newcomers still send me questions about the antenna. Ik wil binnenkort een zs6bkw ophangen voor de banden 80m t/m 10m. 51 metres), with a 40 ft (12. It needs a 1:1 choke-balun at the BALanced twinlead to UNbalanced coax junction. 55 m dipole fed with a 8. Single band half-wave dipole antenna. Operating the ZS6BKW on 60m, 30m, and/or 15m (No Tuner Required) Cecil Moore, www. Comet CBL1000 balun 1 KW. Deze Balun heeft 2 kernen op elkaar om de maximale isolatie impedantie te krijgen over de hele HF band. The ZS6BKW Multi-band HF Antenna April 7, 2017 This is the antenna for you guys who want to get on HF effectively and haven't too much space or cash to throw around. Available. High Quality PVC Dogbone Insulators; Uses Top Quality 1:1 Balun; This G5RV is 92 feet long. A Mini-Balun BLT. If you prefer to submit a PDF form you can download the form HERE. SOTA - First use of a ZS6BKW Antenna Andrew VK1AD / 17/03/2019 Friday 1 February 2019 - Today is the 6th anniversary of SOTA in VK1 and to celebrate the occasion four VK1 SOTA activators are heading for the hills; Bill VK1MCW, Tony VK1VIC, Dermy VK1FDHA and myself. EFHW Elecraft end-fed EZNEC Field Day Golden Packet hexbeam J-Pole Kenwood kj4faj KX3 kx4o measurement mobile. Designed as a three half wave collinear for 20m it was soon discovered that the twin feeder allowed multi band operation. Different models handle RF power levels from 100 to 1000 watts. This fixed the problem. This is the antenna for you guys who want to get on HF effectively, and haven’t too much space or cash to throw around. The next evolution in the search for the all band HF antenna was made by Brian Austin, ZS6BKW, now G0GSF, who in 1985 was a professor at the University of Witwatersrand, Johannesburg, South Africa. Yellowjack tower tool with lanyard. The improved SWR is retained with an antenna as inverted "V" configuration, only the resonance decreases. Musings on Antennas, Tuners and Baluns. The balanced feeder runs into the Shack and through a home-brew 1:1 Balun wound on an FT240-31 ferrite toroid followed by a short length of RG58 to the back of my MFJ-948 ATU. ZS6BKW has its antenna modeled with a program starting from the known G5RV antenna. The original G5RV antenna design included the circuit for a suitable tuning unit, although there are many tuning units that are able to provide a good match. It will provide years and years of great service and great contacts. The ZS6BKW (early 1980’s) was derived from the G5RV by Brian Austin (G0GSF, formerly ZS6BKW). Use only 300. Link URL: ZS6BKW. My Favorite Loop. Bazooka Balun Dipole. SWR Chart (Using the FT817's scale) 10m WSPR Results. I use ferrite sleeve (‘choke’) baluns, constructed with 25mm HP pipe, RG8-X coaxial cable The Wireman (US) and 8 of Amidon ferrite beads type FB-31-5621. long, often too long for vertical deployment with telescopic poles and not too practical in highly constrained…. Because the 300 Ohm line is no longer easy to obtain, the program was used with a 450 Ohm type. Dit doen we door aan beide uiteinden van de dipolen 2 stuks verlengspoelen te plaatsen. Louis Varney (G5RV) invented this antenna in 1946. Ham Radio Antenna Wifi Antenna Radio Shop Hf Radio Ham Radio Operator Radio Band Cool Wood Projects Electrical Projects Diy Speakers This aerial covers the 20, 17, 15, 12 and 10 metre bands and is made from a single 3 metre length of 22 mm copper tube cut into 4 pieces of equal length. 3/16" Black Dacron - Poly Rope Double braid. Here's a picture and a description of one used on a ZS6BKW by a well-known poster:. Revisiting the GR5V and ZS6BKW Multi-band Antennas. Handles full legal limit power. ZS6BKW-Light 80-10m (mit Balun) 28,00 m: 200 Watt SSB/CW: mit Balun: 95,00 €. Bugstick for 20m-10m. Available. feeder 5,18 meter 450 Ohm. ZS6BKW-Antenne. The G5RV is probably the most popular multi band antenna in the world. Article de CQ magazine novembre 1995. slideshow 1. The ZS6BKW type antenna is a version of the G5RV optimized by Brian Austin G0GSF (ex ZS6BKW). vee to run 10m-80m but I am looking for a way to ALSO be on 160m to make a few dozen contacts in. The final ZS6BKW antenna is a 2 × 13. In the mid-1980s, Brian Austin (ZS6BKW) ran computer analysis to develop an antenna system that would match the maximum number of HF bands possible without an antenna tuner, using 50-ohm coaxial cable as the main feed line. If it is desired to use 300Ω ribbon type feeder for this section, it is strongly recommended that the type with "windows" (ladder line) be used because of its much lower loss than that with solid insulation throughout its length, and its relative freedom from the "detuning" effect caused by rain or snow. The mast can get up to 40' or so, which will make for a good apex. SHORTWAVE WIRE ANTENNAS G5RV to ZS6BKW modification useable for 40, 20, 17, 12, 10 and 6m my goal for this work: In 2007 I installed an G5RV antenna to make my first steps on shortwave. Bazooka Balun Dipole. How to build a ZS6BKW Antenna - VK2KMI. The next evolution in the search for the all band HF antenna was made by Brian Austin, ZS6BKW, now G0GSF, who in 1985 was a professor at the University of Witwatersrand, Johannesburg, South Africa. I've always been a fan of wire antennas. The tuner works best if it is near a grounding point. Ladder-line feed may have to be trimmed for lowest SWR, but using about a 100 foot length seems to make for easier tuning on all bands. (that is the question) •Varney initially recommended using a Balun –In 1984 he retracted that after doing further measurements. OFF-CENTER FED K4TR WINDOM ANTENNA 300F 160-10 - $169. •Design Note: only use core based baluns in matched. The ZS6BKW follows the design of the G5RV, but makes improvements. Dit doen we door aan beide uiteinden van de dipolen 2 stuks verlengspoelen te plaatsen. 3-1/2" Wire Spacing. Die ZS6BKW-Antenne ist auf der Grundlage der G5RV-Antenne entstanden. Computer Optimized G5RV design. Link URL: ZS6BKW. Basicly the ZS6BKW is the "NEW AND IMPROVED VERSION OF MR. I just put up an OCF dipole using an excellent 4:1 balun the OCF Dipoles 1. Using a tuner, 6, 15, 30 & 80m bands are. Volgens de specs resoneert dit op 10, 12, 17, 20 en 40 meter. Wires 1 & 2 represent the antenna, wires 3 & 4 the vertical ladderline section, and wire 6 the coax section. Deze zijn 260 uh. Assuming the ferrite used in the w1jr balun is an acceptable material, e. A Mini-Balun BLT. Baluns voor Yagi Antennes, ZS6BKW, Dipool. Maple Leaf Studio is a "labor of love". 102 feet long, shorter than 80 Meter. Il funzionamento e' garantito, costruzione facile e veloce, non richiede molta manualita' soprattutto se si realizza lo STUB o trasformatore in cavo coax 75 Ohm RG-59 balun 2:1, attenzione la DELTA LOOP ha una impedenza tipica tra 100 e 120 Ohm, ma sagomando opportunamente l'ANGOLO di attacco del coassiale e' possibile variarne l'impedenza da. My friend Henk PE1PEX bought this antenna a while ago just out of curiosity. G5RV HF Antenna. If the antenna system is fed directly or with a coaxial balun, it is to long on 80 and the SWR is not very suitable. GB ZS6BKW 10-80 +60m. The ZS6BKW antenna Will prcduce a better than VSWR on parts of five amateur bands (7, 14, 18. 1 metres of 300 ohm ribbon to a 1:1 balun (15 turns of RG 58 around a ferrite rod from an old am radio) and 4 metres of coax to the rig. on every band, day and night. If you prefer to submit a PDF form you can download the form HERE. 8 m long 300 Ohm ribbon line. Il funzionamento e' garantito, costruzione facile e veloce, non richiede molta manualita' soprattutto se si realizza lo STUB o trasformatore in cavo coax 75 Ohm RG-59 balun 2:1, attenzione la DELTA LOOP ha una impedenza tipica tra 100 e 120 Ohm, ma sagomando opportunamente l'ANGOLO di attacco del coassiale e' possibile variarne l'impedenza da. At my parents' house, I had 35m of 20A electrical wire strung between the chimneys of two houses, and that was enough to drive an eight ohm speaker from a crystal set. These improvements allow it to be used on more bands, and to exhibit better SWR on several Bands. Wer die Antenne am Ende der Wireman Leitung mit Koaxial-Kabel speisen möchte, sollte es so kurz wie möglich halten. Antenna Currents. Notice that:. 8-1mm koperdraad. The above example was a small part of that thread. The ZS6BKW Multi-band HF Antenna April 7, 2017 This is the antenna for you guys who want to get on HF effectively and haven't too much space or cash to throw around. Onderstaande tip komt van Rob PA3EKE. One element of the original design that seems odd is the suggestion that no balun is needed at connection between the twin-feeder and. Multi-band HF Antennas Part 1 - VA3TPV ZS6BKW. like the ZS6BKW i was using at the QTH at the time of writing. 14 KB Binaural Basics. If you prefer to submit a PDF form you can download the form HERE. A Mini-Balun BLT. 0, 03/16/2018. txt) or read online for free. Moore and I have been trading emails over the past few months and he just published an article entitled How to Transform Your ZS6BKW Into an All-HF-Band Antenna. Onlangs maakte ik een ZS6BKW antenne, door een 2 x 13,75 meter dipool te voeden via 12,2 mtr 450 Ohm lintkabel voor je naar de coax gaat. LDG desktop tuners are perfect for your home shack, but can also be used portable or mobile if the need arises. Homebrew G5RV wire antennas category is a curation of 46 web resources on , G5RV Optimization, Antennes: La G5RV ), G5RV antenna project by F5JTZ. A shortened Fan Dipole is a dual-band dipole with a full-size dipole also tied to the same center insulator. Introducing the W8AMZ 80-6m OCF / Windom Multi-Band Antenna using a 4:1 Balun and rated for 2 KW. This is a popular antenna design as the - Balun Designs This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. Jul 15th 2012, 15:52: W4RQ Joined: Apr 26th 2011, 23:40 Total Topics: 0 Total Posts: 0 I plan to build this Optimized G5RV (with the top section 90. En résumé, le 1/1 de tension est celui qui donne les meilleurs résultat faible perte +-1 point de signal. Obviously this ZS6BKW was the "magic" I needed. Professor Brian Austin ZS6BKW remodelled and revised the dimensions of the antenna with improved results and ease of construction. BUILD AN AIR WOUND 1:1 CHOKE BALUN FOR HF - THE UGLY BALUN! What others are saying. Professor Brian Austin ZS6BKW remodelled and revised the dimensions of the antenna with improved results and ease of construction. Here is the ZS6BKW antenna installed at AK6R fine tuned for the CW/FT8 frequencies on 40-20-17-12-10 meters. Quality 450 Ohm Ladder Line and Stranded Tinned Copper Wire. For more information, see the Frequently Asked Questions (FAQ) Page. Prof Austin was engaged at the Faculty of Electrical Engineering at the University of the Witwatersrand, Johannesburg, South Africa, when the following article appeared in RadioZS of June 1985. Die Tauglichkeit der Antenne zusammen mit dem GC-3000 hat sich am letzten Sa/So am CQ WW DX Contest wieder bewiesen. hf antennas. 75 m dipole fed with a 12. HF ZS6BKW JUNIOR Multi Band Antenna. How to build a ZS6BKW Antenna - VK2KMI. 4m; ZLL 420Ω; Height 20m. G5RV ZS6BKW Dipole length is 101. I apologize for the poor photos of the SWR chart, but I just got my AA-30 analyzer, and discovered it does not save for later review, so I had to take a photo of the screen to get this… I added the band. Basicly the ZS6BKW is the "NEW AND IMPROVED VERSION OF MR. The SWR is a little better on 80 than the ZS6BKW. It needs no tuner on 40m, 20m and 10m. Moore and I have been trading emails over the past few months and he just published an article entitled How to Transform Your ZS6BKW Into an All-HF-Band Antenna. It could be improved b y capacitances in the feedline. Combined Ladder Line plus Coax Loss for a G5RV / ZS6BKW. One Conductor from Balun or Tuner to Far End Insulator (TM) No Splices, Solder or Crimping to Fail. all the parts you can change if you wanted. 96% Nominal Velocity Factor. MFJ G5RV antennas are multi-band, center-fed dipole antennas capable of 1,500 watts. A good 1:1 choke balun at the coax to twinlead junction virtually eliminates common mode current on the coax. Moore and I have been trading emails over the past few months and he just published an article entitled How to Transform Your ZS6BKW Into an All-HF-Band Antenna. 8-1mm koperdraad. Bij meten bleek de. SWR Chart (Using the. His ZS6BKW multiband antenna took the original G5RV and adjusted the length of the radiators and ladder line matching. Particularly important is the fact that this new antenna is designed for use with 50 ohm cable and not the 70-100 ohm twin lead of 1958. The SWR is generally below 1. available in two sizes covering either 80 - 10m or 40 - 10m with fitted 300 or 450 ohm twin feeder in the centre to an so239 socket. I prefer to use 450 ohm 18 AWG solid…. To Balun, or not to Balun…. Rescue Tape Black. with a tuner at the bottom it put's alot of stress on the balun, with core loss and heat as a consequence. SHORTWAVE WIRE ANTENNAS G5RV to ZS6BKW modification useable for 40, 20, 17, 12, 10 and 6m my goal for this work: In 2007 I installed an G5RV antenna to make my first steps on shortwave. This is a popular antenna design as the - Balun Designs This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. 1 ft Dipole 14-16 Gauge (Copperweld) 93. The G5RV antenna (c. For more information, see the Frequently Asked Questions (FAQ) Page. Balun Designs for Wireless - Mixers, Amplifiers and Antennas. Balun Designs Baluns now available for $85 each. Designed as a three half wave collinear for 20m it was soon discovered that the twin feeder allowed multi band operation. The history and basic theory of this antenna dates back to 1946. MFJ 1778M G5RV Jr. Last JOTA we took an ICOM AH-710 wire antenna with us for some experimenting. My homebrew ZS6BKW is 28. Wire Antennas provide multi-band coverage with just one wire antenna. This antenna uses a twin lead matching stub instead of a 4:1 balun. Bij meten bleek de. 73 - Joe K1JEK [email protected] Ladder-line feed may have to be trimmed for lowest SWR, but using about a 100 foot length seems to make for easier tuning on all bands. I did this as well. Notice that:. It's no wonder it's an efficient multi-band antenna that's only 52 ft. Double Zs6bkw Double Zs6bkw. All-Band Doublet L. Overall lenght is 91ft the GB ZS6BKW new 80-10 antenna is constucted with 3mm PVC coated steel wire,it consists of a flat top plus a section of 450oHm Ladder line. Covers all bands, 160-10 Meters with antenna tuner. We don’t use low-budget accessories. MFJ MFJ-1778 SKU: ZMF-1778. The standard full-size Cobra for 160-10. 3m) long- almost vertical but comes into the house about 3 ft above ground level using commercial feed made from copper clad steel to an antenna matching unit (Palstar AT1KM) 66. A shortened Fan Dipole is a dual-band dipole with a full-size dipole also tied to the same center insulator. Outdoor workbench. We will be continually updating this page as we launch new reviews. ZS6BKW & G5RV. Cb dipole antenna Cb dipole antenna. Balun, unun et choke balun résultat. The popular multiband baluns use ferrite loading to achieve a wide bandwith--this works well, but only if the impedance is kept low. The two baluns are shown in the photo below. The method of construction and tuning is essentially the same for both antennas but the dimensions are different. Plug your coax right into this antenna. No BALUN Is Used As A BALUN Dramatically Reduces All Band Operation And Transmit Efficiency. You can see the 300 feedline terminated at a 1:1 BALUN choke view west to the Brindabella Ranges ZS6BKW antenna apex at 9 metres mounted as an Inverted V ZS6BKW antenna at Mt Stromlo VK1/AC-043 17:20h local (07:20 UTC) Sun is setting in the west behind the Brindabella Ranges Last light - Mt Stromlo optical and lazer ranging telescopes. It will provide years and years of great service and great contacts. 600Ω Open Wire Ladder Line Doublet. pdf http://www. As a first try, I would like to connect the ladder line directly to the balanced input of my MFJ-993B ATU, which is equipped with a 4:1 current balun. Use one of these to connect one of our CMCs as current BALUN for your wire Dipole antenna, G5RV / ZS6BKW or any other antenna with a SO239 connector. This package will give you the same band coverage. SHORTWAVE WIRE ANTENNAS G5RV to ZS6BKW modification useable for 40, 20, 17, 12, 10 and 6m my goal for this work: In 2007 I installed an G5RV antenna to make my first steps on shortwave. Still testing both but so far the ZS6BKW has been most impressive on 40 and 20 meterers (will tune on 80 but with higher SWR due to shorter length. Amateur Radio (G3TXQ) I became interested in radio in the late 1950s when my parents bought me an Ivalek crystal set as a Christmas present, and later on an ex-army receiver - the Wireless Set R208 - which was advertised at the time as the "Sputnik Special" because it covered the low VHF frequencies used by the first Russian satellites. In essence the antenna is a dipole flattop 92' long with 39' of 450 ohm ladder line into a 1:1 choke-balun to 50 ohm coax. A balun goes between the twin lead and the open wire. org/tis/info/pdf/0710060. 5m radiation of the major lobes on. , extreme low or high impedances) at the tuner end, on all bands. I've always been a fan of wire antennas. The ZS6BKW type antenna is a version of the G5RV optimized by Brian Austin G0GSF (ex ZS6BKW). The ZS6BKW follows the design of the G5RV, but makes improvements. The G5RV Pro ZS6BKW. The bifilar windings have been adjusted (spacing) to produce transmission lines with Zo of 50 or 75 ohms as required for best matching. Introducing the "All-Band" Doublet: What the Student and the Instructor Should Keep in Mind L. via balun Ground 7. SOTA - First use of a ZS6BKW Antenna Andrew VK1AD / 17/03/2019 Friday 1 February 2019 - Today is the 6th anniversary of SOTA in VK1 and to celebrate the occasion four VK1 SOTA activators are heading for the hills; Bill VK1MCW, Tony VK1VIC, Dermy VK1FDHA and myself. The famous G5RV-style antenna is the most popular ham radio antenna in the world! You hear strong signals from a G5RV Jr. The SWR measurements were taken at the end of the feedline, not at the W2AU balun feed point. 52 ft when vf=. The SWR is generally below 1. The G5RV antenna (c. To minimize the chance of common mode currents on the coax that can cause the coax to become part of the antenna a balun is sometimes used. 4 inch ferrite cores, type 43 or 77 material. SWR Chart (Using the FT817's scale) 10m WSPR Results. An antenna tuner with a built in balun matches the feed-line impedance to the 50-Ω coax to your radio. ZS6BNE Bungi shock. Single band resonant end fed.